RSBBM
My brother does not use FB social media but uses their app on his iphone for their games when he's idle/waiting.
He tells me that he's constantly being chided by individuals that are in his iphone contact list. These people are telling him that he showed up as people you may know, and sent him a friend request, and he never acknowledged the request (true, he uses only the game screen)!
I'm sure this is something you agree to (the fine print you don't read) when you download or activate FB app on your phone or device.
MOO